Wraps data with type information for structured data handling.
与 .wl 参考的差异： `Dataset` variance
Dataset[data]
Normal[Dataset[{<|"a" -> 1|>, <|"a" -> 2|>, <|"a" -> 3|>}][Select[#a > 1 &]]]
→ {<|a -> 2|>, <|a -> 3|>}Dataset[{<|"a" -> 1|>, <|"a" -> 2|>}][Total, "a"]
→ 3Normal[Dataset[{<|"a" -> 1|>, <|"a" -> 2|>}][2]]
→ <|a -> 2|>Total[Dataset[{1, 2, 3}]]
→ 6Mean[Dataset[{1, 2, 3}]]
→ 2Head[Total[Dataset[{1, 2}]]]
→ IntegerHead[Sort[Dataset[{3, 1, 2}]]]
→ DatasetNormal[Sort[Dataset[{3, 1, 2}]]]
→ {1, 2, 3}Dataset[{{1, 2}, {3, 4}}][[2, 1]]
→ 3Dataset[{<|"a" -> 1, "b" -> 2|>}][[1, "a"]]
→ 1Normal[Dataset[{<|"a" -> 1, "b" -> 5|>, <|"a" -> 1, "b" -> 6|>}][GroupBy["a"]]]
→ <|1 -> {<|a -> 1, b -> 5|>, <|a -> 1, b -> 6|>}|>Query[Total][Dataset[{1, 2, 3}]]
→ 6- Alignment — default { Left , Baseline }
- Background — default None
- DatasetTheme — default Automatic
- HeaderAlignment — default { Left , Baseline }
- HeaderBackground — default Automatic
- HeaderDisplayFunction — default Automatic
- HeaderSize — default Automatic
- HeaderStyle — default None
- HiddenItems — default None
- ItemDisplayFunction — default Automatic
- ItemSize — default Automatic
- ItemStyle — default None
- MaxItems — default Automatic